v1.3.1 - fails to parse empty gzipped files

I have noted the following difference in behaviour of readr v1.1.1 and readr v1.3.0 when handling empty gzipped files.

### readr v1.1.1
```bash
printf '' > empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt')"
```
```console
# A tibble: 0 x 0
```
```bash
gzip empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt.gz')"
```
```console
# A tibble: 0 x 0
```

### readr v1.3.1
```bash
printf '' > empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt')"
```
```console
# A tibble: 0 x 0
```
```bash
gzip empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt.gz')"
```
```console
Error in guess_header_(datasource, tokenizer, locale) :
  Cannot read file /tmp/RtmpnGGnIo/file4c96730e72d7: Invalid argument
Calls: <Anonymous> ... col_spec_standardise -> guess_header -> guess_header_
Execution halted
```

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v1.3.1 - fails to parse empty gzipped files #963

jemunro
openedon Jan 29, 2019

readr v1.1.1

readr v1.3.1

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